280 CRUSTACEA. 



tato, dentibus acutis, subcequis, dente 5to minima; margine arbitali 

 inferiore k-ldbato. Pedes antici breves, manu nan armatd, brachio 

 antice 3-spinoso, spind mediand majore. Pedes sex proximi gracillimi, 

 nudi, tarso longissimo. Pedes postici breviores, tarso dblongo, elliptico, 

 apice breviter uni-spinoso. 



Carapax transverse, not areolate, smooth, granulate, nude ; front 

 entire, slightly emarginate at middle, antero-lateral margin seven- 

 toothed, teeth acute, subequal, fifth tooth much smaller than the 

 others ; inferior orbital margin unequally four-crenate. Anterior 

 feet short, hand without spines, arm with three spines on the ante- 

 rior margin, the middle spine longest. Next six feet very slender, 

 nude, tarsus very long. Posterior feet shorter, tarsus oblong 

 elliptic, with a short spine at apex. 



Plate 17, fig. 4 a, male, enlarged four diameters; b, under view of 

 part of front, showing base of outer antennas, and outline of orbit 

 below; c, outer niaxilliped; d, male abdomen; e, arm, under view, 

 separated from following joints. 



Paumotu Archipelago ? 



Length of carapax, two and one-fourth lines; breadth, three and a 

 half lines; ratio of length to breadth, 1:1-5. The carapax has a 

 short arcuate line on its surface near each posterior tooth, but is other- 

 wise nearly smooth. The specimen may be young, yet has characters 

 that separate it widely from other genera. 



GENUS THALAMITA, Latreille, De Haan. 



Carapax latus, fronte longiore quam semilatitudo carapacis, margine 

 antero-laterali longitudinali. Articulus antennae, externce Imus prce- 

 longus, articulo sequente orbitd remotissimo. 



Carapax broad, front longer than half the breadth of carapax, antero- 

 lateral margin longitudinal. First joint of outer antennas very 

 long, and following joint inserted far from orbit. 



The old genus Thalamita, is divided by De Haan into Oceanus (for 



